Ra's al Ghul.
He forces Batman outside of his comfort zone (Gotham), he has far more resources than Wayne Enterprises, he is the grandfather of Damian Wayne, he has the Justice League's attention, and he was the first villain ever to know Batman's secret identity without taking off his mask.
He forces Batman outside of his comfort zone (Gotham), he has far more resources than Wayne Enterprises, he is the grandfather of Damian Wayne, he has the Justice League's attention, and he was the first villain ever to know Batman's secret identity without taking off his mask.
he can only beat up scarecrow & penguin....
I would of offed his ass. Dude murders half of Gotham and Bats is like, "I have a code!" Make one exception. 

